Asian Journal of Fisheries and Aquatic Research

Aim: Abattoirs are one of the most pronounced but yet ignored sources of highly recalcitrant wastewater that has significant impacts on the environment. The aim of this study was to assess the impacts of Kabundaire abattoir effluents on the quality of water in the receiving Mpanga river, Fort Portal tourism city of Uganda. The study also estimated the amount of water used and wastewater generated in the facility between December 2018 and December 2019, and the number of animals slaughtered per month in the abattoir.

Study Design: This research employed a quantitative research design.

Place and Duration of Study: Samples were collected from six different sites of Mpanga river at intervals of 2 km from Fort Portal town: upstream (Kahungabunyoni and Kagote A), midstream/ effluent discharge point (Kabundaire and Mpanga market) and downstream (Rwabuhinga and Kitumba) along Mpanga river stretch in the morning and evening hours. The analyses were done at National Water & Sewerage Corporation, Fort Portal, Uganda. The sampling and experimental work was done between May 2019 and August 2019.

Methodology: The physicochemical properties (pH, temperature, dissolved oxygen, total nitrates and total phosphates) and microbiological (Escherichia coli and total coliform) profile of the water samples were determined following standard methods. To quantify the amount of water used and wastewater generated, the number of cattle, goats and sheep slaughtered per day between December 2018 and April 2019 were retrieved from abattoir records and extrapolated.

Results: Analytical results indicated that the  evaluated water quality parameters were in the range of 6.93 ± 0.02 to 7.90 ± 0.16, 22.0 ± 0.14 ℃ to 23.6 ± 0.26 ℃, 0.01 ± 0.00 mg/L to 0.26 ± 0.02 mg/L, 6.30 ± 0.03 mg/L to 10.00 ± 0.03 mg/L, 4.20 ± 0.05 mg/L to 9.70 ± 0.02 mg/L, 4 × 102 CFU/mL to 48 × 103 CFU/mL, 1.4 × 104 CFU/mL to 6.6 × 106 CFU/mL for pH, temperature, dissolved oxygen, total phosphates, total nitrates, Escherichia coli and total coliforms, respectively. Most of the parameters were above permissible limits except pH, temperature and total nitrates. An average of 133 cattle, 78 goats and 33 sheep are slaughtered in Kabundaire abattoir every month. The actual number varies by month, depending on the demand for meat. The amount of water used, and the wastewater generated were estimated at 15,768 m3/year and 18,396 m3/year, respectively.

Conclusion: Discharge of effluents from Kabundaire abattoir into Mpanga river negatively affects its water quality. Mpanga river water is not safe for domestic use without further treatment/purification. We recommend that an anaerobic wastewater treatment facility should be installed at Kabundaire abattoir to enhance environmental conservation. Further studies should determine the actual amount of water used and wastewater generated at the facility.

This study was conducted at Gezira Irrigation canal to evaluate the growth performance and the effect of water tempetrature to the culture ability of Nile tilapia juveniles for 120 days. Monosex Oreochromis niloticus sized 8.17±0.33 g were carried out from Mabroka fish farm and stocked in 400 m³ fixed cages at a density of 50 fish/m³. Fish were fed daily with a commercial pellet diet with 33% protein concentration at a feeding rate of 3% of their body weight per day. Feed was given twice a day (09:00 morning and 16:00 evening). Fish growth parameters, water quality analysis have measured every two weeks. The final body weight of fish was 40.23±1.04 grams and the mean daily gained weight was 0.29 g/day, while the survival rate of fish was 99.7%±6.7 and the Food Conversion Ratio (FCR) was 3.8. The average value of temperature, pH and transparency were 23°C, 7.5, 31.5 cm respectively. The results of the study revealed that there is a possibility to culture tilapia juvenile at stocking density of 50/m³ in fixed cages in Irrigation Canals, for the effect of water temperature on fish growth performance the results obtained that no more effect on fish growth during study period.

This study examines the growth and yield of Vietnamese koi with Thai koi for developing a suitable culture management technique of koi for sustainable production and unveiling the most cost effective culture of koi species. The study was conducted for a rearing period of 100 days in four farms at Gauripur upazila in Mymensingh district in Bangladesh. The treatment 1 (T₁), treatment 2  (T₂) are considered for Vietnamese koi and treatment 3 (T₃), treatment 4 (T₄) are considered for Thai koi with stocking density 1,72,900 per hectare for T₁ and T₃ and 2,47,000 for T₂ and T₄ at four different farms of study area. The ponds were stocked with an initial length of 0.75±0.01 cm and weight of 0.20 g in all the treatments. The culture period has the optimum level of physicochemical parameters. The study reveals that the maximum weight gain was in treatment T₁ of Vietnamese koi and lowest in treatment T₄ of Thai koi. Similarly, physical length, weight and survival of Anabas testudineus also followed the same trends as weight gain. Individually treatment T₁ shows significantly higher specific growth rate than the other treatments. Besides, food conversion ratio was significantly higher in treatment T₁ followed by treatment T₂, T₃ and T₄. However, the mean fish production were 17092, 15000, 10746 and 10469 kg/ha in treatment T₁, T₂, T₃ and T₄ respectively. Consistently, highest growth, survival and higher net economic benefit from A. testudineus were found in treatment T₁ among the four treatments. Vietnamese koi population of treatment T₁ has appeared to be most suitable for good quality aquaculture practice for 100 days rearing semi-intensive system among the four treatments. Therefore, monoculture practice of Vietnamese koi is a perfect scheme of choice for a commercially viable and sustainable koi culture to meet up the protein deficit and as well as to accelerate the sustainable development of Bangladesh.

Optimum feeding schedule is one of the main things for the proper growth of fish and other animals. A study was conducted to optimize the effects of different feeding frequencies on growth performance and production of Rui (Labeo rohita) under pond cage culture system in Rajshahi, Bangladesh. Labeo rohita with an average weight of 302.23±4.07g (mean ± SD) were randomly stocked in 9 cages at 30 fish/cage in all the treatment. Fish were fed (4% of body weight) a commercial floating feed with three different feeding schedules: feeding of fish thrice daily in T₁treatment; twice in T₂ treatment and once in T₃ treatment. Water quality parameters were measured during the study period. The physico-chemical parameters of pond water were within suitable ranges for fish culture in cages. The obtained values of the water quality parameters were temperature 28.26 to 28.46°C, pH 6.91 to 6.94, DO 5.04 to 5.33 mg/l, CO₂ 2.95 to 3.02 mg/L. The mean final weight gain was significantly highest in T₁ (345.05 g) a followed by T₂ (324.66 g) and T₃ (257.82 g). The Specific growth rate (SGR) value were significantly higher in T₁ treatment (0.91% bwd^-1; Body weight per day) than T₂ (0.87% bwd^-1) and T₃ treatment (0.73% bwd^-1). The feed conversion ratio (FCR) value was significantly lower in T₁ fish group (2.72) than other two T₂ (2.84) and T₃ (3.44) treatments. The fish productions were 18.13, 17.55 and 15.67 kg/cage/cycle in T₁, T₂ and T₃ respectively. The highest net profit was found (Bangladeshi Taka, BDT 1445.38) in T₁ compared to T₂ (BDT 1329.24) and T₃ treatment (BDT 937.99). The cost benefit ratio (CBR) was significantly higher in T₁ (0.57) than T₂ (0.53) and T₃ (0.37). The feeding schedule three times in a day was most suitable than other two schedules.

The role of the fish basket woman is not only as a housewife but also as a breadwinner, thus the fish basket woman has a dual role in her family. Fish basket women help their husbands work to be able to meet family needs. This study aims to analyze household income as well know the motivation to work of women as fish baskets in increasing working household income and know the factors that affect the income of fish basket women in increasing household income in Eretan Wetan Village, Indramayu Regency, West Java. The research method used in this research is a case study and interviews using a questionnaire. The sampling technique used an accidental sampling method with a total of 50 respondents and collecting data using observation techniques, structured interviews, and documentation techniques. The results showed that the role of women with fish baskets on household income in Eretan Wetan Village, Indramayu Regency, West Java was quite significant by obtaining an average income of IDR 1,676,135 per month. Factors that affect the income of working basket women include helping their husbands, wages that are not appropriate, helping household income and the husband's income is uncertain. The coefficient of determination shown by Nagelkerke R-Square, age, education level, number of family members, husband's permission, and husband's income affect women's interest in working by 100.0%. Women’s interest in working is not influenced by any other factors included in the research mode.